I agree with the idea of doing harmonics in scales, and you did get the good benefit of knowing where they are on the string. It is also important that they sustain, which you get by not pressing on the string, only touching the node and using pressure only on the playing finger. Please do know the harmonics of the twelfth, as Salzedo used them in his well-titled marvelous Poem of the Little Stars, and I use them in my compositions as well. They are quite useful. Interestingly, you can produce them by going in the direction of the sounding board, as well as the neck. That being said, they are not commonly called for.